The Green Festival, Saturday from 10 to 9 and Sunday from 11 to 7 at the Washington Convention Center, 801 Mount Vernon Place NW, celebrates environmentally responsible living with more than 250 exhibitors, panel discussions, film screenings and community action workshops. Among the speakers are Body Shop founder Anita Roddick, journalist Barbara Ehrenreich and Washington chef Nora Pouillon. The nearest Metro station is Mount Vernon Square-Convention Center. Admission is $10, students and seniors $5. Call 202-249-3400 or visit www.greenfestivals.com.

A Return to the Past

More than 35 artisans in period attire will demonstrate their skills and sell their

Colonial-style crafts in tin, wood, metal,

ceramics, pewter and other media at the ninth annual 18th-Century Craft Fair on the grounds of Mount Vernon, the first

president's last home, Saturday and Sunday from 9 to 5. There will also be 18th-century entertainment, food vendors, and free cruises on the Potomac with Spirit Cruises and the Potomac Riverboat Company.

Admission is $11, seniors $10.50, ages 6 to 11 $5, younger free. Mount Vernon is on the southern end of the George Washington Memorial Parkway, about eight miles south of Alexandria. Call 703-780-2000 (TDD: 703-799-8697).

Fiesta at the Zoo

The National Zoo, 3001 Connecticut Ave. NW (Metro: Woodley Park-Zoo), celebrates the cultures of Latin America at Fiesta Musical Sunday from 11 to 5, with traditional music and folk dancing, food vendors, crafts and special presentations by the zoo's specialists. Admission is free. Call 202-673-4821.